How to Twist a Dragon's Tale

Hiccup Horrendous Haddock III was an awesome sword-fighter, a dragon-whisperer and the greatest Viking hero who ever lived. His memoirs look back to when Hiccup was just an ordinary boy, and he found it very hard to be a hero. Someone has stolen the Fire Egg. Now the volcano on Volcano Island is active, and the tremors are hatching the eggs of the Exterminator dragons. Can Hiccup return the Fire Egg to the volcano, stop the volcano from erupting, and save the tribes from being wiped out by the terrible sword-claws of the Exterminators?